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# This shell script emits a C file. -*- C -*-

# Copyright 2007, 2008, 2009 Free Software Foundation, Inc.

# Contributed by M R Swami Reddy 

#

# This file is part of the GNU Binutils.

#

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 3 of the License, or

# (at your option) any later version.

#

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,

# MA 02110-1301, USA.

#

# This file is sourced from elf32.em, and defines extra cr16-elf

# specific routines.

#

fragment <

#include "ldctor.h"

/* Flag for the emulation-specific "--no-relax" option.  */

static bfd_boolean disable_relaxation = FALSE;

static void check_sections (bfd *, asection *, void *);

/* This function is run after all the input files have been opened.  */

static void

cr16_elf_after_open (void)

{

  /* Call the standard elf routine.  */

  gld${EMULATION_NAME}_after_open ();

   if (command_line.embedded_relocs

       && (! link_info.relocatable))

     {

       bfd *abfd;

      /* In the embedded relocs mode we create a .emreloc section for each

         input file with a nonzero .data section.  The BFD backend will fill in

         these sections with magic numbers which can be used to relocate the

         data section at run time.  */

      for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link_next)

        {

          asection *datasec;

          /* As first-order business, make sure that each input BFD is either

             COFF or ELF.  We need to call a special BFD backend function to

             generate the embedded relocs, and we have such functions only for

             COFF and ELF.  */

          if (bfd_get_flavour (abfd) != bfd_target_coff_flavour

              && bfd_get_flavour (abfd) != bfd_target_elf_flavour)

            einfo ("%F%B: all input objects must be COFF or ELF for --embedded-relocs\n");

          datasec = bfd_get_section_by_name (abfd, ".data.rel");

          /* Note that we assume that the reloc_count field has already

             been set up.  We could call bfd_get_reloc_upper_bound, but

             that returns the size of a memory buffer rather than a reloc

             count.  We do not want to call bfd_canonicalize_reloc,

             because although it would always work it would force us to

             read in the relocs into BFD canonical form, which would waste

             a significant amount of time and memory.  */

          if (datasec != NULL && datasec->reloc_count > 0)

            {

              asection *relsec;

              relsec = bfd_make_section (abfd, ".emreloc");

              if (relsec == NULL

                  || ! bfd_set_section_flags (abfd, relsec,

                                              (SEC_ALLOC

                                               | SEC_LOAD

                                               | SEC_HAS_CONTENTS

                                               | SEC_IN_MEMORY))

                  || ! bfd_set_section_alignment (abfd, relsec, 2)

                  || ! bfd_set_section_size (abfd, relsec,

                                             datasec->reloc_count * 8))

                einfo ("%F%B: can not create .emreloc section: %E\n");

            }

          /* Double check that all other data sections are empty, as is

             required for embedded PIC code.  */

          bfd_map_over_sections (abfd, check_sections, datasec);

        }

    }

}

/* Check that of the data sections, only the .data section has

   relocs.  This is called via bfd_map_over_sections.  */

static void

check_sections (bfd *abfd, asection *sec, void *datasec)

{

  if ((strncmp (bfd_get_section_name (abfd, sec), ".data.rel", 9) == 0)

     && sec != datasec

     && sec->reloc_count == 0 )

    einfo ("%B%X: section %s has relocs; can not use --embedded-relocs\n",

           abfd, bfd_get_section_name (abfd, sec));

}

static void

cr16elf_after_parse (void)

{

  /* Always behave as if called with --sort-common command line

     option.

     This is to emulate the CRTools' method of keeping variables

     of different alignment in separate sections.  */

  config.sort_common = TRUE;

  /* Don't create a demand-paged executable, since this feature isn't

     meaninful in CR16 embedded systems. Moreover, when magic_demand_paged

     is true the link sometimes fails.  */

  config.magic_demand_paged = FALSE;

  after_parse_default ();

}

/* This is called after the sections have been attached to output

   sections, but before any sizes or addresses have been set.  */

static void

cr16elf_before_allocation (void)

{

  /* Call the default first.  */

  gld${EMULATION_NAME}_before_allocation ();

   if (command_line.embedded_relocs

       && (! link_info.relocatable))

     {

   bfd *abfd;

   /* If we are generating embedded relocs, call a special BFD backend

         routine to do the work.  */

   for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link_next)

      {

          asection *datasec, *relsec;

          char *errmsg;

          datasec = bfd_get_section_by_name (abfd, ".data.rel");

          if (datasec == NULL || datasec->reloc_count == 0)

            continue;

          relsec = bfd_get_section_by_name (abfd, ".emreloc");

          ASSERT (relsec != NULL);

          if (! bfd_cr16_elf32_create_embedded_relocs (abfd, &link_info,

                                                           datasec, relsec,

                                                           &errmsg))

                {

                  if (errmsg == NULL)

                    einfo ("%B%X: can not create runtime reloc information: %E\n",

                           abfd);

                  else

                    einfo ("%X%B: can not create runtime reloc information: %s\n",

                           abfd, errmsg);

                }

       }

     }

  /* Enable relaxation by default if the "--no-relax" option was not

     specified.  This is done here instead of in the before_parse hook

     because there is a check in main() to prohibit use of --relax and

     -r together.  */

  if (!disable_relaxation)

    command_line.relax = TRUE;

}

EOF

# Define some shell vars to insert bits of code into the standard elf

# parse_args and list_options functions.

#

PARSE_AND_LIST_PROLOGUE='

#define OPTION_NO_RELAX                 301

'

PARSE_AND_LIST_LONGOPTS='

  { "no-relax", no_argument, NULL, OPTION_NO_RELAX},

'

PARSE_AND_LIST_OPTIONS='

  fprintf (file, _("  --no-relax                  Do not relax branches\n"));

'

PARSE_AND_LIST_ARGS_CASES='

    case OPTION_NO_RELAX:

      disable_relaxation = TRUE;

      break;

'

# Put these extra cr16-elf routines in ld_${EMULATION_NAME}_emulation

#

LDEMUL_AFTER_OPEN=cr16_elf_after_open

LDEMUL_AFTER_PARSE=cr16elf_after_parse

LDEMUL_BEFORE_ALLOCATION=cr16elf_before_allocation